Indeed. It’s a hard resource to exploit, that one, but it has been done. ;)
It’s harder to hitch a ride on a bird than it is to turn plants into car fuel, though, but, on a less silly note, the fact that so much fertilizer comes from petrochemicals and other non-renewable sources seriously limits the long-term potential of biofuels.
Well, one way to convert nuclear energy into hydrocarbons is fairly common, if rather inefficient.
Well, one way to exploit the properties of air to fly is fairly common, if rather inefficient ;-)
Indeed. It’s a hard resource to exploit, that one, but it has been done. ;)
It’s harder to hitch a ride on a bird than it is to turn plants into car fuel, though, but, on a less silly note, the fact that so much fertilizer comes from petrochemicals and other non-renewable sources seriously limits the long-term potential of biofuels.